What is the role of setContentView() at line 4 in the following piece of code? 1 public class FIT2081 extends Activity { protected void onCreate(Bundle savedInstancestate) {...

What is the role of setContentView() at line 4 in the following piece of code? 1 public class FIT2081 extends Activity { protected void onCreate(Bundle savedInstancestate) { super.onCreate(savedInstancestate); setContentView(R.layout.exam_activity); Here is an easy one.. What is 2x+3x= ?